关键词: 甘蔗花叶病, 甘蔗花叶病, 高粱花叶病毒(SrMV), PCR

Abstract: The combustibility of tobacco leaf samples from Luliang production area (Luliang County of Yunnan Province) in 2013 was not good. To analyze this problem, soil, irrigation water and tobacco leaf samples were taken from the Luliang production area in 2014 and 2015. The samples were tested in laboratory. The results indicated that the chlorine content in all soil samples was in the normal level, and did not exceed the upper limit which is 45 mg/kg. The test results also showed that the chlorine content in irrigation water samples was higher than upper limit. One sample from Longtan village reached 138 mg/kg. The chlorine contents in tobacco leaf samples of X2F, C3F and B2F in 2014～2015 indicated that 75.01% samples was among normal range (from0.3% to 0.8%), 10.41% was below normal (<0.3%), 14.58% was above normal (>0.8%). The chlorine content of control samples from Malong was in the normal range. In 2014 the analysis results found that the potassium content of8.33% samples was higher than 2%,91.67%samples was among 1～2%. And in 2015, the potassium content of 25% samples was over 2%, 75%samples was among 1～2%.The analyzed data of the two years indicated that the ratio of potassium to chlorine in most samples was lower than 4. The main reason is that the potassium contents of tobacco leaves are lower. On the other hand several samples had higher chlorine contents which resulted in lower ratio of potassium to chlorine. In future tobacco production, we should pay great attention to using potassium fertilizer and increase the efficiency of potassium fertilizer.